81817364088 has 32 divisors (see below), whose sum is σ = 227270456400. Its totient is φ = 27272454624.

The previous prime is 81817364047. The next prime is 81817364119. The reversal of 81817364088 is 88046371818.

It is a happy number.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189391831 + ... + 189392262.

Almost surely, 2^81817364088 is an apocalyptic number.

It is an amenable number.

81817364088 is an abundant number, since it is smaller than the sum of its proper divisors (145453092312).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81817364088 is a wasteful number, since it uses less digits than its factorization.

81817364088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378784108 (or 378784098 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 54.

The spelling of 81817364088 in words is "eighty-one billion, eight hundred seventeen million, three hundred sixty-four thousand, eighty-eight".